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platinum: Make some FB_CONFIG_1 bits read only.

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This commit is contained in:
joevt 2024-05-04 21:53:41 -07:00 committed by dingusdev
parent 10a3fa5984
commit 0bca7bc743
1 changed files with 4 additions and 1 deletions
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5
devices/memctrl/platinum.cpp
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@ -248,7 +248,10 @@ void PlatinumCtrl::write(uint32_t rgn_start, uint32_t offset, uint32_t value, in
this->change_display();
break;
case PlatinumReg::FB_CONFIG_1:
this->fb_config_1 = value;
LOG_F(INFO, "%s: write FB_CONFIG_1 %03x.%c = %0*x", this->name.c_str(), offset, SIZE_ARG(size), size * 2, value);
this->fb_config_1 =
(this->fb_config_1 & ~(CFG1_FULL_BANKS | CFG1_VID_ENABLE | CFG1_INTERLACE | CFG1_SAM_512BIT | CFG1_VRAMS_2MBIT)) |
(value & (CFG1_FULL_BANKS | CFG1_VID_ENABLE | CFG1_INTERLACE | CFG1_SAM_512BIT | CFG1_VRAMS_2MBIT));
this->half_bank = !!(this->vram_megs == 1 && (value & CFG1_FULL_BANKS));
break;
case PlatinumReg::FB_CONFIG_2: